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使用simpledateformat，规定好格式，parser出错即为非法/** * calculates the number of days between two calendar days in a manner * which is independent of the calendar type used. * * @param d1 the first date. * @param d2 the second date. * * @return the number of days between the two dates. zero is * returned if the dates are the same, one if the dates are * adjacent, etc. the order of the dates * does not matter, the value returned is always >= 0. * if calendar types of d1 and d2 * are different, the result may not be accurate. */static int getdaysbetween (java.util.calendar d1, java.util.calendar d2) { if (d1.after(d2)) { // swap dates so that d1 is start and d2 is end java.util.calendar swap = d1; d1 = d2; d2 = swap; } int days = d2.get(java.util.calendar.day_of_year) - d1.get(java.util.calendar.day_of_year); int y2 = d2.get(java.util.calendar.year); if (d1.get(java.util.calendar.year) != y2) { d1 = (java.util.calendar) d1.clone(); do { days += d1.getactualmaximum(java.util.calendar.day_of_year); d1.add(java.util.calendar.year, 1); } while (d1.get(java.util.calendar.year) != y2); } return days;}
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